Ferromagnetic Layers in a Topological Insulator (Bi,Sb) 2 Te 3 Crystal Doped with Mn

Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface th...

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Published inACS nano Vol. 16; no. 12; pp. 20831 - 20841
Main Authors Frolov, Alexander S., Usachov, Dmitry Yu, Fedorov, Alexander V., Vilkov, Oleg Yu, Golyashov, Vladimir, Tereshchenko, Oleg E., Bogomyakov, Artem S., Kokh, Konstantin, Muntwiler, Matthias, Amati, Matteo, Gregoratti, Luca, Sirotina, Anna P., Abakumov, Artem M., Sánchez-Barriga, Jaime, Yashina, Lada V.
Format Journal Article
LanguageEnglish
Published United States 27.12.2022
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ISSN1936-0851
1936-086X
DOI10.1021/acsnano.2c08217

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Abstract Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn Sb Bi Te in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb) Te form structures that feature three SLs, each of which is separated by two or three (Bi,Sb) Te quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone.
AbstractList Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn Sb Bi Te in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb) Te form structures that feature three SLs, each of which is separated by two or three (Bi,Sb) Te quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone.
Author Sánchez-Barriga, Jaime
Frolov, Alexander S.
Muntwiler, Matthias
Bogomyakov, Artem S.
Abakumov, Artem M.
Vilkov, Oleg Yu
Sirotina, Anna P.
Amati, Matteo
Usachov, Dmitry Yu
Kokh, Konstantin
Yashina, Lada V.
Golyashov, Vladimir
Tereshchenko, Oleg E.
Gregoratti, Luca
Fedorov, Alexander V.
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  organization: Lomonosov Moscow State University, Leninskie Gory 1/3, 119991Moscow, Russia, N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, 119991Moscow, Russia
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Keywords magnetic topological insulators
surface structure
electron band structure
photoelectron diffraction
ferromagnetism
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Title Ferromagnetic Layers in a Topological Insulator (Bi,Sb) 2 Te 3 Crystal Doped with Mn
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